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A point particle of mass $m$ initially at rest starts to move in a circle of radius $r$ with constant angular acceleration $\alpha$.

After one revolution, what is the angular momentum of the particle around the center of the circle?

A

$mr^2 \sqrt {\alpha\pi}$

B

$mr^2 \sqrt {2\alpha\pi}$

C

$mr\sqrt {2\alpha\pi}$

D

$2 mr\sqrt { \alpha\pi}$

E

$2mr^2\sqrt {\alpha\pi}$

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